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Commitments (Details) MMcf in Thousands, $ in Millions | Mar. 31, 2018 USD ($) MMcf MMBbls
--- | ---
Water Pipeline Commitment [Member] |
Other Commitments [Line Items] |
Water delivery commitments, remaining minimum contractual volumes | MMBbls | 23
Water Purchase Commitment [Member] |
Other Commitments [Line Items] |
Water purchase commitment, minimum volume required | MMBbls | 10
Gas gathering and Oil and Gas Through-put Commitments [Member] |
Other Commitments [Line Items] |
Contractual obligation | $ 461.5
Drilling Rig Leasing Contracts [Member] |
Other Commitments [Line Items] |
Contractual obligation | 158.3
Early termination penalties for rig contracts | 40.6
Electricity Purchase Agreement [Member] |
Other Commitments [Line Items] |
Contractual obligation | $ 31.7
Crude Oil Pipeline Commitment [Member] |
Other Commitments [Line Items] |
Oil and gas delivery commitments, remaining minimum contractual volumes | MMBbls | 18
Natural Gas Pipeline Commitment [Member] |
Other Commitments [Line Items] |
Oil and gas delivery commitments, remaining minimum contractual volumes | MMcf | 769

X
- Definition Early Termination Penalty for Rig Contract Cancellation + References No definition available. + Details
Name: | sm_EarlyTerminationPenaltyforRigContractCancellation
Namespace Prefix: | sm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total amount of water committed to be supplied under existing contracts or agreements. + References No definition available. + Details
Name: | sm_WaterDeliveryCommitmentsandContractsRemainingContractualVolume
Namespace Prefix: | sm_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Volume that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentMinimumVolumeRequired
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total amount of product committed to be supplied under existing contracts or agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1207 -Paragraph (a) -Subparagraph (2) + Details
Name: | us-gaap_OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_WaterPipelineCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_WaterPurchaseCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_PipelineCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_DrillingRigLeasingContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=sm_ElectricityPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis=sm_CrudeOilPipelineCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis=sm_NaturalGasPipelineCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |